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For the current week, the overall ratings of six Software stocks are worse, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

SRS Labs’ (NASDAQ:SRSL) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. SRS Labs develops and licenses audio and voice enhancement technologies. In Portfolio Grader’s specific subcategories of Earnings Growth and Margin Growth, SRSL also gets F’s. For a full analysis of SRSL stock, visit Portfolio Grader.

Nuance Communications (NASDAQ:NUAN) ratings are on the decline this week as the company earns an F (“strong sell”). Last week, it received a D (“sell”). Nuance Communications provides voice and language solutions for businesses and consumers worldwide. The stock also gets an F in Earnings Growth. The stock price has dropped 18.5% over the past month, worse than the 0.7% increase the Nasdaq has seen over the same period of time. The stock has a trailing PE Ratio of 34.10. For more information, get Portfolio Grader’s complete analysis of NUAN stock.

This week, Tangoe Inc.’s (NASDAQ:TNGO) rating worsens to a D from the company’s C rating a week ago. Tangoe, Inc. Company is a global provider of communications lifecycle management, or CLM, software and related services to large and medium-sized businesses and other organizations. . As of Feb. 21, 2013, 13.6% of outstanding Tangoe Inc. shares were held short. The trailing PE Ratio for the stock is 216.70. To get an in-depth look at TNGO, get Portfolio Grader’s complete analysis of TNGO stock.

AsiaInfo-Linkage (NASDAQ:ASIA) is having a tough week. The company’s rating falls from C to a D. AsiaInfo-Linkage provides telecommunications software solutions and information technology (IT) products and services to telecommunications carriers and operators, and cable television operators in the Peoples Republic of China. The stock gets F’s in Earnings Growth and Margin Growth. For a full analysis of ASIA stock, visit Portfolio Grader.

This week, VMware (NYSE:VMW) drops from a D to an F rating. VMware provides virtualization and cloud infrastructure solutions that address a range of information technology problems, including cost and operational inefficiencies, business continuity and software lifecycle management. Share prices fell 22% over the past month. The stock’s trailing PE Ratio is 44.50. To get an in-depth look at VMW, get Portfolio Grader’s complete analysis of VMW stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.